Tuna sandwiches are banned from some offices, but fish dishes in the microwave are absolutely off limits.

"I never knew who the culprit was because the kitchen area was not near my desk," says Casey Corrigan, a media strategist at a New York City PR firm. The smell would waft through the office gently at first, and "then you would feel it more pungently."

You don't want your cube mates wishing you would sleep with the fishes.